5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2001 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
22 #include "silcincludes.h"
25 /* This function creates server or daemon or listener or what ever. This
26 does not fork a new process, it must be done by the caller if caller
27 wants to create a child process. This is used by the SILC server.
28 If argument `ip_addr' is NULL `any' address will be used. Returns
29 the created socket or -1 on error. */
31 int silc_net_create_server(int port, char *ip_addr)
34 struct sockaddr_in server;
35 int len = sizeof(server.sin_addr);
37 SILC_LOG_DEBUG(("Creating a new server listener"));
39 /* Create the socket */
40 sock = socket(AF_INET, SOCK_STREAM, 0);
42 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
46 /* Set the socket options */
47 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
49 SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
53 /* Set the socket information for bind() */
54 memset(&server, 0, sizeof(server));
55 server.sin_family = AF_INET;
57 server.sin_port = htons(port);
59 /* Convert IP address to network byte order */
61 silc_net_addr2bin(ip_addr, (unsigned char *)&server.sin_addr.s_addr, len);
63 server.sin_addr.s_addr = INADDR_ANY;
65 /* Bind the server socket */
66 rval = bind(sock, (struct sockaddr *)&server, sizeof(server));
68 SILC_LOG_ERROR(("Cannot bind socket: %s", strerror(errno)));
72 /* Specify that we are listenning */
73 rval = listen(sock, 5);
75 SILC_LOG_ERROR(("Cannot set socket listenning: %s", strerror(errno)));
79 /* Set the server socket to non-blocking mode */
80 silc_net_set_socket_nonblock(sock);
82 SILC_LOG_DEBUG(("Server listener created, fd=%d", sock));
87 /* Closes the server by closing the socket connection. */
89 void silc_net_close_server(int sock)
94 SILC_LOG_DEBUG(("Server socket closed"));
97 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
98 socket or -1 on error. This blocks the process while trying to create
101 int silc_net_create_connection(const char *local_ip, int port,
105 struct hostent *dest;
106 struct sockaddr_in desthost;
108 SILC_LOG_DEBUG(("Creating connection to host %s port %d", host, port));
111 dest = gethostbyname(host);
113 SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
114 "IP address", host));
118 /* Set socket information */
119 memset(&desthost, 0, sizeof(desthost));
120 desthost.sin_port = htons(port);
121 desthost.sin_family = AF_INET;
122 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
124 /* Create the connection socket */
125 sock = socket(AF_INET, SOCK_STREAM, 0);
127 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
131 /* Bind to the local address if provided */
133 struct sockaddr_in local;
134 int local_len = sizeof(local.sin_addr);
136 /* Set the socket information for bind() */
137 memset(&local, 0, sizeof(local));
138 local.sin_family = AF_INET;
140 /* Convert IP address to network byte order */
141 silc_net_addr2bin(local_ip, (unsigned char *)&local.sin_addr.s_addr,
144 /* Bind the local socket */
145 rval = bind(sock, (struct sockaddr *)&local, sizeof(local));
147 SILC_LOG_ERROR(("Cannot connect to remote host: "
148 "cannot bind socket: %s", strerror(errno)));
153 /* Connect to the host */
154 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
156 SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
162 /* Set appropriate options */
163 #if defined(TCP_NODELAY)
164 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
166 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
168 SILC_LOG_DEBUG(("Connection created"));
173 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
174 socket or -1 on error. This creates non-blocking socket hence the
175 connection returns directly. To get the result of the connect() one
176 must select() the socket and read the result after it's ready. */
178 int silc_net_create_connection_async(const char *local_ip, int port,
182 struct hostent *dest;
183 struct sockaddr_in desthost;
185 SILC_LOG_DEBUG(("Creating connection (async) to host %s port %d",
189 dest = gethostbyname(host);
191 SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
192 "IP address", host));
196 /* Set socket information */
197 memset(&desthost, 0, sizeof(desthost));
198 desthost.sin_port = htons(port);
199 desthost.sin_family = AF_INET;
200 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
202 /* Create the connection socket */
203 sock = socket(AF_INET, SOCK_STREAM, 0);
205 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
209 /* Bind to the local address if provided */
211 struct sockaddr_in local;
212 int local_len = sizeof(local.sin_addr);
214 /* Set the socket information for bind() */
215 memset(&local, 0, sizeof(local));
216 local.sin_family = AF_INET;
218 /* Convert IP address to network byte order */
219 silc_net_addr2bin(local_ip, (unsigned char *)&local.sin_addr.s_addr,
222 /* Bind the local socket */
223 rval = bind(sock, (struct sockaddr *)&local, sizeof(local));
225 SILC_LOG_ERROR(("Cannot connect to remote host: "
226 "cannot bind socket: %s", strerror(errno)));
231 /* Set the socket to non-blocking mode */
232 silc_net_set_socket_nonblock(sock);
234 /* Connect to the host */
235 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
237 if (errno != EINPROGRESS) {
238 SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
245 /* Set appropriate options */
246 #if defined(TCP_NODELAY)
247 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
249 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
251 SILC_LOG_DEBUG(("Connection operation in progress"));
256 /* Closes the connection by closing the socket connection. */
258 void silc_net_close_connection(int sock)
263 /* Set's the socket to non-blocking mode. */
265 int silc_net_set_socket_nonblock(int sock)
267 return fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
270 /* Converts the IP number string from numbers-and-dots notation to
273 bool silc_net_addr2bin(const char *addr, unsigned char *bin,
279 ret = inet_aton(addr, &tmp);
284 SILC_PUT32_LSB(tmp.s_addr, bin);
289 /* Converts the IP number string from numbers-and-dots notation to
290 binary form in network byte order. */
292 bool silc_net_addr2bin_ne(const char *addr, unsigned char *bin,
298 ret = inet_aton(addr, &tmp);
303 SILC_PUT32_MSB(tmp.s_addr, bin);